Serhiy Tkach, Serial Killer and Rapist of Dead Females

(Wikipedia exact wording source) Serhiy Fedorovich Tkach, Ukranian, born September 15, 1952, is a former police criminal investigator, originally from Russia, and a convicted serial killer who claimed to have killed 100 people.

He suffocated girls aged between eight and 18 and performed sexual acts on their bodies after they were dead. Although Tkach admitted his crimes and demanded the death penalty, after a one-year trial, a tribunal sentenced him to life imprisonment for the rape and murder of 36 women over more than two decades.

Over the years, nine people had been wrongly jailed for some of the murders of which Tkach was later found guilty. One of the men who was wrongly accused killed himself. Another was not released until March 2012.

What kind of mind does these acts? Thinks these things? Lives with himself each day? How do we stop this?